Stuffing-box.



M. GUUNER.

STUFFiNG BOX= APPLICATION FILED DEC. i. ISS.

rings vwithin the q 'nir aar.,

Triana, or -scina/toison; "ri-nantaise.

sanremo-sox. A

Application tiled Ueccmber l., 1915,.

lowing is a specification.

My invention relates to stalling boxes of the type in which flexible `lianged packing rings are separated ,by rigid metal rings,

vand the particular object of my invention to provide a stalling box of this type which allows of an automatic adjusting of the tightening pressure in accordance with the working pressure oi' the machine.

inthe stuffing box according to the pres-V ent invention pairs ot' elastic packing rings provi-ded with cylindrical liangesembracing the piston rod, each pair of rings inclosing; a. hollow ring-space, are lixcd between rigid metal rings, which serve for rigidly l1olding thcrlat exterior parts of said elastic stuflng box shellt against any axial/l displacement. The working pressure of the machine tends to lift the elastic' ring of each pair of rings which is nearest to the chamber to be kept tight, off the rigid metal ring supporting it, so 'as to force it -above the, flange of they elastic ring next to it. .y A

The preferred form of a stufiing box according to my invention is represented in longitudinal section in the drawings accornf panying this specification.

a is the stuffing box shell, b is the piston rod, c and i are ball bearings serving to keep said rod in axial position within the shell.

e c are rigid metal rings embracing the piston rod, said rings having a liat surface directed toward the chamber to be kept tight and 'an inclined surface directed toward the outside, a conical recess being thus formed in each ring. Flanged elastic packing rings f of any suitable material such as leather, vulcan liber, rubber, asbes tos, sheet metal and the like, cover said conih cal recesses. Each ring f is provided with a cylindrical flange z' embracing the piston rod. Another elastic ring g, which may consist of a similar material, is inserted betweeneach ring f and the next following metal ring e, the main part of said rings g ybeing flat,

" While their flanges h are beveled and enter into the interstices between the piston rodand the flanges @I of rings f.

i By tightening the screw cap fm, the pack- `Specification of Letters Patent.

latented Nov. 2i, illicit. serial No. carica. l

ing rings f and g are pressed against each other at their outer periphery by the rigidv metal rings, their diameter being thus increased, which tends to tighten the space contained within the stuiling box shell. @n

the other hand the working pressure of the V machine presses the elastic rings f toward the rings g, the rings i being thereby forced above the beveled edges 'oli the ianges L of rings g, said ianges being iirmly pressed' against the piston rodu fit. the saine time the rings f are bodily lifted ofi the. conical 'recesses ot' the metal rings e and are forced into the ring shaped hollow spaces 0 formed between rings f' and g, thus acting like diaphragme in compressingtbe airor gas confined within said spaces. The air or gas thus compressed within said spaces exerts a uniform pressure upon the cylindrical flanges )i of rings g, such pressure being required for keeping the stuffing box absolutely tight in the case of a rotating piston rod being inserted therein.

As soon as the working pressure is reduced the rings ,fare relieved and owing to their conical shape glide back somewhat on the beveled edges of thev iange-s h. The pressure within the spaces o being reduced simultaneously, the flanges is, are equally relieved. l

' I claim l. In a stuffing box, incombinatiom'an outer shell, rigid metallic rings located witlr in said shell and presenting substantially fiatv surfaces ,to the base end of said sliell and a substantially funnel-shaped surface to the' outer end of said shell, and a'pair of elastic packing rings between each two metallic rings, one elastic ring `being closely applied to the funnel-shaped surfacebf the metal ring, While the other elastic ring is applied to the fiat surface of the metal ring next following, a cylindrical 'flange provided at the inner edge of the first named elastic ring extending into the opening of said metal ring I and a'cylindrical'ange at the innerl edge of the other elastic rind,

2. In'a stuffing boX1n/co1nbination, an outer shell, rigid metallic rings-located witb- ,in4 said shell and presenting substantially fiat.

surfaces to the base end of said shell and a substantially -funnebshaped surface to the outer end of said shell, and a pair of elastic packing rings between each I two metallic rings, one elastic ring being closely applied to the funnel-shaped surface oi the metal ring, while the other elastic r'ing is applied to the flat surface of the metal ring next following, a cylindrical flange provided at the inner edge of the first named yelastic ring extending into the opening of said metal ring and a cylindrical ange at the inner edge of the other elastic ring, the free edge of said flange being beveled. l

,3. In a stuffing box, in combination, an outer shell, rigid metallic rings within said Shell, ring shaped interstices of substantially 'tngular section between said rings and u pair of internally Vflanged elastic packing rings confined between each two succeeding metallic rings, said elastic rings being 15 lV. H. MEERCxl-i, M. ROTHE. 

